* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,
body {
  width: 100%;
  height: 100%;
  display: flex;
  background-color: #333333;
  justify-content: center;
  align-items: center;
}
div {
  width: 99%;
  height: 99%;
  padding: 0;
  background-color: #ffffff;
  border: 1px solid rebeccapurple;
}
textarea {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  border: none;
  resize: none;
  cursor: pointer;
  background-color: #ffffff;
  color: #000000;
  font-size: 20px;
  font-family: Helvetica;
}